Please help in need of advice

[Holdenvz05]

Hey guys I have a 2005 vz ute it was running fine then all of a sudden was running rough.Now when I put my foot down it revs like it should but has no power and it's splutering but when I just touch the accelerator it seems to run fine.Ihave replaced the fuel filter I have checked the coil packs and they seem fine any help will do thanks all.

 

[krusing]

Sounds like a Vac leak,

Faulty ground connection,

What has been done to it of recent ?
Any mods,
Cabling, wiring,
Engine work ?

 

[Holdenvz05]

Sounds like a Vac leak,

Faulty ground connection,

What has been done to it of recent ?
Any mods,
Cabling, wiring,
Engine work ?

No work done to it it had a miss when I got it so I replaced the faulty coil pack ran great the went for a hour drive and stoped jumped back in and has been running rough since then.

 

[BlackVXGTS]

Hairline crack in spark plug(s)?

 

[VF2R]

Any DTCs?

 

[_R_J_K_]

Have had a collapsed cat converter cause similar issues.

 

[Holdenvz05]

I have replaced spark plugs and coil packs and has not fixed the problem

 

[Wats_in_a_name]

Had it scanned and did any codes come up? How long had it been since the fuel filter was replaced? Did the "Check Powertrain" warning come up?

 

[Fu Manchu]

I’m going to say it, did you buy the plugs off eBay or online?

I’d also be checking all the hoses that attach to the intake. Make sure none have come off or are hard and brittle causing vacuum leaks.

Did you use new metal gaskets on the intake?

 

[rambunctious]

No work done to it it had a miss when I got it so I replaced the faulty coil pack ran great the went for a hour drive and stoped jumped back in and has been running rough since then.

You say coil pack.
Did you replace all 6 coils ?
I would, along with a new plenum gasket.